Thermal battery system and ignition method of the same

A thermal battery system comprising:

• a thermal battery assembly including a plurality of thermal batteries arranged in series and in parallel;
• an ignition circuit connected to the plurality of thermal batteries in the thermal battery assembly;
• and
• a control unit configured to control the ignition circuit such that each of the plurality of thermal batteries in the thermal battery assembly is selectively ignited,
• wherein the ignition circuit comprises:
• a first terminal configured such that a first ignition voltage is applied;
• a second terminal configured such that a second ignition voltage is applied;
• a plurality of first wires connecting first ignition electrodes of thermal batteries arranged in series from among the plurality of thermal batteries;
• a plurality of second wires connecting second ignition electrodes of thermal batteries arranged in parallel from among the plurality of thermal batteries;
• a plurality of first switches connecting the plurality of first wires and the first terminal, according to control by the control unit;
• and
• a plurality of second switches connecting the plurality of second wires and the second terminal, according to control by the control unit, and
• the control unit is configured to turn on one of the plurality of first switches and one of the plurality of second switches and selectively ignite a thermal battery in which a first ignition electrode is connected to a first wire corresponding to the turned-on first switch and a second ignition electrode is connected to a second wire corresponding to the turned-on second switch.